77 kz750 kickstart problems

Hi I have a 77 kz750 for a week it ran 16 yrs ago strong got put in shed and given to me I kick it a few times to check if it was seized up it kicked just fine so I was happy. Well anyways got it home and charged batery took off the gas tank cleaned it out. Tried to start it with key and starter just whined , so I kicked it two times and now the kickstart is stuck at top position so I thought worst is my engine siezed hmmmm. So I took the crank case cover off and turned the crank with wrench and I had my plugs out and both pistons move so I'm so confused please help me. Bike has 21,000

Going to sound stupid, but are you sure its in neutral? Try shifting back and forth between neutral and first and keep trying. I had this issue when I accidentally got stuck in 3rd at a stop light....